Vacuum tank laser welding equipment for vacuum unit

Abstract

The invention relates to the field of laser welding equipment, in particular to vacuum tank laser welding equipment for a vacuum unit, which comprises an operating table provided with a three-jaw chuck, a welding gun is arranged on the rear side of the operating table through an adjusting mechanism used for adjusting angles, and an aligning mechanism used for corresponding to a sealing cover and a tank body is arranged on the operating table. The sealing cover and the outer side of the tank body are clamped through the abutting plate at the same time, the sealing cover is guided through the abutting plate in the clamping process, the sealing cover and the tank body are automatically and coaxially arranged, the coaxiality of the sealing cover and the tank body is ensured, the pushing assembly can turn over the abutting plate in the welding stage to enable the abutting plate to be converted into the abutting state from the clamping state, and the welding efficiency is improved. And meanwhile, the positioning stability of the sealing cover is enhanced, the two rollers are adopted to abut against the upper side of the sealing cover and the upper side of the tank body correspondingly, the rollers drive the welding gun to adjust the inclination angle in real time through the swing assembly, it is ensured that laser beams of the welding gun are effectively shot into the seam all the time, and the defect of molten pool deviation or incomplete fusion caused by fall is avoided.

Description

Technical Field

[0001] The invention relates to the field of laser welding equipment, in particular to vacuum tank laser welding equipment for a vacuum unit. Background Art

[0002] As one of the core components of a vacuum unit, the vacuum tank is mainly used to maintain a high vacuum environment in a closed cavity. Its structure is usually composed of a tank body and a cover connected by a circular weld. The accuracy, airtightness and strength of the weld are extremely high. Laser welding has gradually become a key technology in the manufacture of vacuum tanks due to its advantages such as high energy density, small heat-affected zone and fast welding speed.

[0003] At present, the device for laser welding of vacuum tanks generally adopts the following structure: a three-jaw chuck is installed on the operating table for centering clamping and axial rotation of the tank body, and the welding gun is fixed to the rear side of the operating table through a driving arm, such as a linear guide rail, and moves along a preset path to align the weld.

[0004] Specifically, the cover is temporarily fixed to the tank body by spot welding, and then the three-jaw chuck synchronously clamps the outer wall of the tank body to ensure that it rotates at a constant speed during the welding process, so that the welding gun performs laser welding along the joint between the tank body and the cover to form a continuous and uniform weld.

[0005] Although the existing devices are relatively mature in basic welding functions, they still have significant defects in practical applications. First, the alignment error between the cover and the tank body is difficult to eliminate. Due to factors such as processing accuracy, assembly tolerance or material deformation, there are often axial or radial deviations at the joint between the cover and the tank body, that is, alignment errors. In particular, when manual alignment spot welding is used, it is impossible to guarantee the accurate alignment of the cover and the tank body, which causes weld offset and uneven penetration, resulting in reduced welding quality.

[0006] Secondly, the welding gun has insufficient adjustment flexibility when welding to a weld with a drop position. When the alignment error objectively exists, the welding guns of existing devices mostly use fixed angles or single degree of freedom adjustment, and cannot adapt to the drop or tilt between the cover and the can body in real time. For example, if there is a height difference between the can body and the cover seam, the traditional welding gun lacks adaptive deflection function, and it is difficult for the laser beam to efficiently enter the weld, which can easily lead to molten pool offset or unfused defects. Summary of the invention

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vacuum tank laser welding device for a vacuum unit, comprising an operating table equipped with a three-jaw chuck, a welding gun is arranged on the rear side of the operating table through an adjustment mechanism for adjusting the angle, and a positioning mechanism for corresponding the cover and the tank body is arranged on the operating table.

[0008] The adjustment mechanism includes a movable arm that is slidably arranged at the rear side of the operating table, a cantilever is slidably arranged at the front side of the movable arm, two rollers are connected to the lower part of the front side of the cantilever through a swing assembly, and a welding gun is also connected to the swing assembly.

[0009] The cantilever drives two rollers to respectively lean against the upper sides of the cover and the tank body through the swing assembly. When there is a height difference between the cover and the tank body, the roller drives the welding gun to deflect to a corresponding angle through the swing assembly.

[0010] The alignment mechanism comprises a support which slides left and right on the operating table, a sliding column is arranged on the left side of the support for sliding left and right, and abutment plates are arranged on the sliding column at equal intervals along the circumference of the sliding column through a pushing assembly.

[0011] The abutment plate slides along the radial direction of the sliding column, thereby clamping the cover and the outer side of the can body at the same time. The abutment plate is flipped by the pushing assembly, so that the abutment plate changes from clamping the cover to pushing the cover.

[0012] Preferably, the swing assembly includes two arc grooves arranged vertically and opened on the lower side of the cantilever, the two arc grooves are coaxially arranged, and the axis of the arc groove is located at the lower part of the welding gun, and an L-shaped plate is slidably arranged on the lower side of the cantilever, and the vertical section of the L-shaped plate is slidably connected to the inside of the two arc grooves through two raised columns.

[0013] Preferably, the horizontal section of the L-shaped plate is fixedly connected to the welding gun, and the lower side of the cantilever is provided with two sliding square rods arranged left and right for sliding up and down. The lower side of the sliding square rod is rotationally connected to the roller at the corresponding position, and a tension spring is provided between the sliding square rod and the cantilever.

[0014] Preferably, a T-shaped plate is rotatably arranged on the cantilever, and two waist-shaped grooves symmetrically arranged on the horizontal section of the T-shaped plate are provided. The rear side of the sliding square rod is slidably connected to the corresponding waist-shaped grooves through a linkage column. A slot is provided on the vertical section of the T-shaped plate, and a fixed column slidably connected to the inside of the slot is fixedly installed on the vertical section of the L-shaped plate.

[0015] Preferably, the pushing assembly comprises a sliding sleeve slidably arranged on the sliding column, and adjustment plates slidably arranged along the radial direction of the sliding sleeve at equal intervals along the circumference of the sliding sleeve, and the adjustment plate is hinged to the middle part of the abutting plate.

[0016] Preferably, a baffle is slidably provided on the horizontal section of the adjustment plate, a moving part is slidably provided on the sliding column, and the baffle is slidably connected to the moving part along the radial direction of the sliding column.

[0017] Preferably, a screw is rotatably provided inside the sliding column, the screw is threadedly connected to the sliding sleeve, a supporting ring is rotatably provided at the left end of the sliding column, and a hydraulic cylinder for driving the moving part to slide left and right is fixedly installed on the support.

[0018] Preferably, a plurality of spring telescopic rods are hinged to the moving member at equal intervals along its circumferential direction, and the spring telescopic rods are hinged to the abutting plate.

[0019] Preferably, a synchronous ring is rotatably arranged on the left side of the sliding sleeve. A plurality of connecting plates are hinged to the synchronous ring at equal intervals along its circumferential direction. The connecting plates are hinged to the adjusting plates at corresponding positions, and the adjusting plates are fixedly connected to the sliding sleeve through fastening screws.

[0020] Preferably, the left side of the abutting plate has an arc-shaped structure that gradually bends away from the axis of the sliding column from right to left. A blocking block is slidably arranged along the radial direction of the sliding column in the middle of the abutting plate, and a spiral spring is arranged between the blocking block and the abutting plate.

[0021] The beneficial effects of the present invention are as follows: First, the present invention clamps the cover and the outer side of the tank body simultaneously through the abutting plate, and guides the cover during the clamping process. When the abutting plate contacts the tank body, the cover is automatically arranged coaxially with the tank body, effectively eliminating assembly errors, ensuring the coaxiality of the two, and during the welding stage, the pushing component can flip the abutting plate to change its state from the clamping state to the abutting state, while enhancing the positioning stability of the cover and reducing the offset caused by welding vibration.

[0022] Second, the present invention uses two rollers to abut against the upper sides of the cover and the tank body respectively. If there is a height difference between the two, the rollers drive the welding torch to adjust the inclination angle in real time through the swinging component, ensuring that the laser beam of the welding torch always effectively enters the joint, avoiding defects such as molten pool offset or lack of fusion caused by the height difference, and significantly improving the laser energy utilization rate and the weld quality.

[0023] Third, the present invention adopts the adjusting plate to slide radially along the sliding sleeve, which can flexibly adjust the distance between the abutting plate and the axis of the sliding column to meet the clamping requirements of workpieces with different diameters. At the same time, the relative distance between the abutting ring and the sliding sleeve can be adjusted by rotating the screw rod, further optimizing the adaptability to different covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the drawings and embodiments.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the support, sliding column, abutting plate and adjusting plate in the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the sliding column, abutting ring, adjusting plate and spring telescopic rod in the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the sliding sleeve, synchronous ring, connecting plate and baffle in the present invention.

[0029] Figure 5 It is a schematic diagram of the partial structures of the three-jaw chuck, the operating table, the cantilever and the L-shaped plate in the present invention.

[0030] Figure 6 It is a partial cross-sectional view of the cantilever, the welding torch, the L-shaped plate and the sliding square rod in the present invention.

[0031] Figure 7 It is a cross-sectional view of the T-shaped plate, the cantilever, the sliding square rod and the L-shaped plate in the present invention.

[0032] Figure 8 It is a cross-sectional view of the abutting plate and the blocking block in the present invention.

[0033] In the figure: 1. Three-jaw chuck; 2. Operating table; 3. Adjusting mechanism; 4. Welding torch; 5. Alignment mechanism; 31. Moving arm; 32. Cantilever; 33. Swing assembly; 34. Roller; 51. Support; 52. Sliding column; 53. Pushing assembly; 54. Abutting plate; 331. L-shaped plate; 332. Sliding square rod; 333. T-shaped plate; 521. Screw; 522. Abutting ring; 523. Hydraulic cylinder; 531. Sliding sleeve; 532. Adjusting plate; 533. Blocking block; 534. Baffle; 535. Moving part; 536. Synchronous ring; 537. Connecting plate; 538. Spring telescopic rod. Detailed implementation manners

[0034] The embodiments of the present invention will be described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. For those technologies or conditions not specified in the embodiments, they shall be carried out according to the technologies or conditions described in the literature in the field or according to the product specifications.

[0035] Refer to Figure 1 、 Figure 2 and Figure 5 , a vacuum tank laser welding device for a vacuum unit, including an operating table 2 equipped with a three-jaw chuck 1, a welding torch 4 is arranged at the rear side of the operating table 2 through an adjusting mechanism 3 for adjusting the angle, and an alignment mechanism 5 for corresponding the cover and the tank body is arranged on the operating table 2.

[0036] When circumferential welding of the cover and the tank body is required, first, the operator centeringly clamps the tank body through the three-jaw chuck 1, then the operator manually places the cover inside the alignment mechanism 5, so that the alignment mechanism 5 automatically centers and limits the cover, then moves the alignment mechanism 5 to the left, the alignment mechanism 5 drives the cover to be coaxially aligned and abuts against the right side surface of the tank body, and then moves the welding torch 4 to the connection part of the cover and the tank body through the adjusting mechanism 3, then rotates the tank body through the three-jaw chuck 1, the tank body drives the cover to rotate synchronously, and at the same time welds the connection part of the cover and the tank body through the welding torch 4.

[0037] See also Figure 1 , Figure 2 , Figure 3 and Figure 8 The alignment mechanism 5 includes a support 51 that slides left and right on the operating table 2. A sliding column 52 is provided on the left side of the support 51 for sliding left and right. Abutment plates 54 are provided on the sliding column 52 at equal intervals along the circumference of the sliding column 52 through a pushing component 53. The abutment plates 54 slide along the radial direction of the sliding column 52 to clamp the cover and the outer side of the can body at the same time. The abutment plates 54 are flipped by the pushing component 53, so that the abutment plates 54 change from clamping the cover to pushing the cover.

[0038] It should be noted that the support 51 is driven by an existing electric slide rail assembly so that the support 51 can slide left and right on the operating table 2 .

[0039] In order to facilitate the operator to put the cover between the abutment plates 54 and prevent the cover put between the abutment plates 54 from falling out, the following design is made: Figure 2 and Figure 4 A blocking block 533 is provided in the middle part of the abutment plate 54 for radial sliding along the sliding column 52, a coil spring is provided between the blocking block 533 and the abutment plate 54, the left and right sides of the blocking block 533 close to one end of the axis of the sliding column 52 are both inclined structures, and the left side of the abutment plate 54 is an arc structure that bends gradually from right to left in the direction away from the axis of the sliding column 52.

[0040] When it is necessary to weld the cover and the tank body, the operator manually moves the cover from left to right between the abutment plates 54. The cover can be quickly moved between the abutment plates 54 by the guidance of the arc-shaped structure on the left side of the abutment plates 54. At this time, the side of the abutment plate 54 close to the axis of the sliding column 52 is in contact with the outside of the cover, and then the cover continues to be moved to the right so that the outside of the cover contacts the inclined structure of the blocking block 533.

[0041] like Figure 8 As shown, the cover slides along the inclined structure of the blocking block 533, thereby pushing the blocking block 533 to move outward. When the cover is completely moved to the right part of the blocking block 533, the coil spring pushes the blocking block 533 to the initial position through its own elastic force, so that the vertical surface of the blocking block 533 abuts against and blocks the left part of the cover, thereby preventing the cover from falling out.

[0042] See also Figure 2 , Figure 3 and Figure 4 The pushing assembly 53 includes a sliding sleeve 531 which is slidably arranged on the sliding column 52 left and right. The sliding sleeve 531 is provided with adjusting plates 532 which slide radially along the sliding sleeve 531 at equal intervals along its circumference. The adjusting plate 532 is hinged to the middle part of the abutting plate 54.

[0043] In order to facilitate the quick alignment of different covers and the tank body, the following structure is made to adapt to different covers and the tank body for alignment through prior adjustment: Continue to refer to Figure 2 、 Figure 3 and Figure 4 , a screw rod 521 is rotatably arranged inside the sliding column 52. The screw rod 521 is threadedly connected with the sliding sleeve 531, and a abutting ring 522 is rotatably arranged at the left end of the sliding column 52.

[0044] Refer to Figure 2 and Figure 4 , a synchronizing ring 536 is rotatably arranged on the left side of the sliding sleeve 531. Connecting plates 537 are equally spaced and hinged along the circumferential direction of the synchronizing ring 536. The connecting plates 537 are hinged to the corresponding adjusting plates 532, and the adjusting plates 532 are fixedly connected to the sliding sleeve 531 through locking screws.

[0045] The operator manually moves one of the adjusting plates 532 radially along the sliding column 52 in advance. The manually moved adjusting plate 532 drives the synchronizing ring 536 through the corresponding connecting plate 537, and the synchronizing ring 536 in turn pushes the remaining adjusting plates 532 to move synchronously through the remaining connecting plates 537, so that all the adjusting plates 532 can move synchronously. At the same time, the adjusting plates 532 drive the abutting plate 54 to move synchronously, so that the abutting plate 54 can clamp covers and the tank body with different diameters.

[0046] When the cover moves between the abutting plates 54 and the blocking block 533 blocks the left part of the cover, the arc structure on the right part of the cover abuts against the left part of the abutting ring 522, thereby restricting the position of the cover between the abutting plates 54. The operator drives the sliding sleeve 531 to move relative to the abutting ring 522 in the left-right direction by manually rotating the screw rod 521 in advance. The sliding sleeve 531 drives the blocking block 533 to move left and right synchronously through the adjusting plate 532 and the abutting plate 54, so as to adjust the distance between the blocking block 533 and the abutting ring 522 to adapt to different covers.

[0047] Refer to Figure 2 、 Figure 3 and Figure 4 , a baffle 534 is slidably arranged left and right on the horizontal section of the adjusting plate 532. A moving member 535 is slidably arranged left and right on the sliding column 52. The baffle 534 is slidably connected to the moving member 535 along the radial direction of the sliding column 52. A number of spring telescopic rods 538 are equally spaced and hinged along the circumferential direction of the moving member 535. The spring telescopic rods 538 are hinged to the abutting plate 54. A hydraulic cylinder 523 for driving the moving member 535 to slide left and right is fixedly installed on the support 51.

[0048] In the initial state, the telescopic section of the hydraulic cylinder 523 is in the extended state, so that the hydraulic cylinder 523 pushes the moving part 535 against the right side surface of the sliding sleeve 531. At this time, the moving part 535 drives the baffle 534 to move to the side of the abutting plate 54 away from the axis of the sliding column 52, and limits the abutting plate 54 by blocking it with the baffle 534, so that the right part of the abutting plate 54 is arranged horizontally left and right, so that the abutting plate 54 can fit on the outside of the cover, center and position it, and at this time the spring telescopic rod 538 is in a compressed state.

[0049] When the cover is centered and positioned between the abutting plates 54, move the support 51 to the left, so that the support 51 pushes the cover and the abutting plate 54 to move to the left synchronously, so that the arc structure on the left part of the abutting plate 54 moves to the outside of the tank body. Through the guidance of the arc structure of the abutting plate 54, the side of the abutting plate 54 close to the axis of the sliding column 52 smoothly moves and abuts against the outside of the tank body. Thus, by clamping the tank body and the cover simultaneously with the abutting plate 54, the tank body and the cover are arranged coaxially, effectively reducing the alignment error between the tank body and the cover.

[0050] Subsequently, continue to move the support 51. The support 51 drives the blocking block 533 to contact the right side surface of the tank body through the abutting plate 54, so that the tank body pushes the blocking block 533 along the inclined surface of the blocking block 533 in the direction away from the axis of the sliding column 52. When the blocking block 533 completely moves to the outside of the tank body, the support 51 pushes the cover to abut against the tank body through the abutting ring 522, so that the cover and the tank body are coaxially and correspondingly abutted together.

[0051] After that, contract the telescopic section of the hydraulic cylinder 523, so that the hydraulic cylinder 523 drives the moving part 535 to move away from the sliding sleeve 531 to the right. The moving part 535 drives the baffle 534 to move synchronously. During this process, the spring telescopic rod 538 elongates by its own elastic force. When the left side surface of the baffle 534 completely moves to the right part of the rotation axis of the abutting plate 54 and the adjusting plate 532, the baffle 534 no longer blocks the left part of the abutting plate 54, so that the left part of the abutting plate 54 can deflect in the direction away from the axis of the sliding column 52 at this time.

[0052] At the same time, the spring telescopic rod 538 extends to the longest state, and then continue to slide the moving part 535 to the right, so that the moving part 535 pulls the left part of the abutting plate 54 to deflect in the direction away from the axis of the sliding column 52 through the spring telescopic rod 538, so that the abutting plate 54 no longer clamps the cover and the tank body. At the same time, the abutting plate 54 drives the blocking block 533 to no longer contact the joint of the cover and the tank body, preventing the blocking block 533 from scratching the joint when the cover and the tank body are rotated, ensuring the roughness of the joint, ensuring the welding quality, and ensuring the smooth rotation of the cover and the tank body, preventing the influence on the welding quality caused by friction and vibration.

[0053] It should be noted that a rotating roller is rotatably arranged on one side of the right part of the abutting plate 54 close to the axis of the sliding column 52. After the blocking block 533 no longer contacts the joint position, the abutting plate 54 is continuously pulled to deflect, so that the rotating roller on the abutting plate 54 rotates and abuts against the arc surface of the cover. By the way of pushing the cover with the rotating roller, the cover is further pressed tightly against the tank body, effectively increasing the stability of the cover and the tank body during welding. Moreover, with a number of rotating rollers arranged circumferentially, the cover can also be centered and supported to a certain extent, ensuring the coaxiality of the cover and the tank body during welding.

[0054] Refer to Figure 1 , Figure 5 , Figure 6 and Figure 7 , the adjusting mechanism 3 includes a moving arm 31 slidably arranged left and right at the rear side of the operating table 2. A cantilever 32 is slidably arranged up and down at the front side of the moving arm 31. Two rollers 34 are connected to the lower part of the front side of the cantilever 32 through a swinging assembly 33. A welding torch 4 is also connected to the swinging assembly 33. The cantilever 32 drives the two rollers 34 to respectively abut against the upper sides of the cover and the tank body through the swinging assembly 33. When there is a height difference between the cover and the tank body, the rollers 34 drive the welding torch 4 to deflect at a corresponding angle through the swinging assembly 33.

[0055] Due to the manufacturing errors of the cover and the tank body, even if the tank body and the cover are aligned coaxially, there will be a situation where the joints are misaligned due to the roundness difference at the contact positions between the tank body and the cover. In order to ensure that the welding torch 4 can effectively weld the misaligned joints, the following structural design is made: the swinging assembly 33 includes two vertically arranged arc-shaped grooves opened on the lower side of the cantilever 32. The two arc-shaped grooves are coaxially arranged, and the axis of the arc-shaped groove is located below the welding torch 4. An L-shaped plate 331 is slidably arranged on the lower side of the cantilever 32. Two protruding columns on the vertical section of the L-shaped plate 331 are respectively slidably connected inside the two arc-shaped grooves.

[0056] Refer to Figure 5 , Figure 6 and Figure 7 , the horizontal section of the L-shaped plate 331 is fixedly connected to the welding torch 4. Two left-right arranged sliding square rods 332 are slidably arranged up and down on the lower side of the cantilever 32. The lower sides of the sliding square rods 332 are rotatably connected to the corresponding rollers 34. A tension spring is arranged between the sliding square rods 332 and the cantilever 32.

[0057] Refer to Figure 6 and Figure 7 , a T-shaped plate 333 is rotatably arranged on the cantilever 32. Two symmetrically arranged waist-shaped grooves are opened on the transverse section of the T-shaped plate 333. The rear sides of the sliding square rods 332 are slidably connected inside the corresponding waist-shaped grooves through linkage columns. A notch is opened on the vertical section of the T-shaped plate 333. A fixed column slidably connected inside the notch is fixedly installed on the vertical section of the L-shaped plate 331.

[0058] When the abutting plate 54 presses tightly against the cover through the rotating rollers thereon, through the left - right movement of the moving arm 31 and the up - down movement of the cantilever 32, the L - shaped plate 331 is driven to move synchronously, so that the L - shaped plate 331 drives the welding torch 4 to move to the corresponding joint position between the cover and the tank body. At the same time, the two rollers 34 are respectively pressed against the outer sides of the cover and the tank body. The reaction forces of the cover and the tank body on the rollers 34 push the rollers 34 upward, so that the rollers 34 drive the sliding square rod 332 to stretch the tension spring.

[0059] When the welding torch 4 moves to the corresponding joint position between the cover and the tank body, the tank body is rotated by the three - jaw chuck 1, so that the tank body drives the cover to rotate synchronously through the frictional force and the welded part between the tank body and the cover. At the same time, the welding torch 4 is started to weld the joint between the cover and the tank body.

[0060] When the welding torch 4 welds to the alignment error position between the cover and the tank body, the cover and the tank body push the two rollers 34 to be arranged vertically misaligned, so that the rollers 34 drive the sliding square rod 332 to move synchronously. The sliding square rod 332 drives the T - shaped plate 333 to rotate through the cooperation of the linkage column and the waist - shaped groove. The T - shaped plate 333 drives the L - shaped plate 331 to swing in the same direction along the track of the arc - shaped groove through the cooperation of the notch and the fixed column, so that the L - shaped plate 331 drives the welding torch 4 to deflect to the lower side. And because the axis of the arc - shaped groove is located below the welding torch 4, the welding torch 4 can rotate around the weld, so that the welding torch 4 always aims at the weld, and further effectively ensures that the laser beam of the welding torch 4 can always enter the joint, avoiding the defects of molten pool offset or lack of fusion caused by the height difference, and significantly improving the laser energy utilization rate and the weld quality.

[0061] Refer to Figures 1 to 8 When the present invention welds the cover on the tank body, it further includes the following steps: First step, the operator moves the cover from left to right between the abutting plates 54, and makes the arc - shaped structure on the right part of the cover abut against the left part of the synchronous ring 536. The spiral spring pushes the blocking block 533 to block the left part of the cover through its own elastic force to prevent the cover from falling out.

[0062] Second step, move the support 51 to the left. Through the guidance of the arc - shaped structure of the abutting plate 54, the side of the abutting plate 54 close to the axis of the sliding column 52 smoothly moves and abuts against the outside of the tank body, so that the tank body and the cover are coaxially arranged by simultaneously clamping the tank body and the cover by the abutting plate 54.

[0063] Third step, continue to move the support 51 so that the cover and the tank body are coaxially and correspondingly abutted together. Then, the telescopic section of the hydraulic cylinder 523 is retracted, so that the abutting plate 54 drives the rotating rollers thereon to rotate and abut against the arc - shaped surface of the cover. By the way of pushing the cover with the rotating rollers, the cover is further pressed tightly against the tank body, effectively increasing the stability of the cover and the tank body during welding.

[0064] In the fourth step, the welding torch 4 is driven by the moving arm 31 and the cantilever 32 to move to the corresponding joint position between the cover and the tank body, and at the same time, the two rollers 34 are respectively abutted against the outer sides of the cover and the tank body.

[0065] In the fifth step, the tank body and the cover are rotated by the three-jaw chuck 1, and at the same time, the welding torch 4 is started to weld the joint between the cover and the tank body. By pushing the two rollers 34, the welding torch 4 is deflected toward the lower side of the misaligned joint, so as to effectively ensure that the laser beam of the welding torch 4 can always be incident into the joint.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and still be covered by the protection scope of the present invention.

Claims

1. A laser welding device for a vacuum tank of a vacuum unit, including an operating table equipped with a three-jaw chuck, characterized in that, A welding torch is provided at the rear side of the operating table through an adjusting mechanism for adjusting the angle, and a positioning mechanism for corresponding the cover and the tank body is provided on the operating table; The adjusting mechanism includes a moving arm slidably arranged left and right at the rear side of the operating table. A cantilever is slidably arranged up and down at the front side of the moving arm. Two rollers are connected to the lower part of the front side of the cantilever through a swinging assembly, and a welding torch is also connected to the swinging assembly; The cantilever drives the two rollers to respectively abut against the upper sides of the cover and the tank body through the swinging assembly. When there is a height difference between the cover and the tank body, the rollers drive the welding torch to deflect at a corresponding angle through the swinging assembly; The positioning mechanism includes a support slidably arranged left and right on the operating table. A sliding column is slidably arranged left and right on the left side of the support. Abutting plates are arranged at equal intervals along the circumference of the sliding column through a pushing assembly on the sliding column; The abutting plates simultaneously clamp the outer sides of the cover and the tank body by sliding radially along the sliding column. By flipping the abutting plates through the pushing assembly, the abutting plates are changed from clamping the cover to pushing the cover.

2. The laser welding equipment for a vacuum tank used in a vacuum unit according to claim 1, characterized in that, The swinging assembly includes two vertically arranged arc-shaped grooves opened on the lower side of the cantilever. The two arc-shaped grooves are arranged coaxially, and the axis of the arc-shaped groove is located below the welding torch. An L-shaped plate is slidably arranged on the lower side of the cantilever. Two convex columns on the vertical section of the L-shaped plate are respectively slidably connected inside the two arc-shaped grooves.

3. A laser welding device for a vacuum tank used in a vacuum unit according to claim 2, characterized in that, The horizontal section of the L-shaped plate is fixedly connected to the welding torch. Two sliding square rods arranged left and right are slidably arranged up and down on the lower side of the cantilever. The lower side of the sliding square rod is rotatably connected to the roller at the corresponding position. A tension spring is arranged between the sliding square rod and the cantilever.

4. A laser welding device for a vacuum tank used in a vacuum unit according to claim 3, characterized in that, A T-shaped plate is rotatably arranged on the cantilever. Two symmetrically arranged waist-shaped grooves are opened on the transverse section of the T-shaped plate. The rear side of the sliding square rod is slidably connected inside the corresponding waist-shaped groove through a linkage column. A notch is opened on the vertical section of the T-shaped plate. A fixing column slidably connected inside the notch is fixedly installed on the vertical section of the L-shaped plate.

5. A laser welding device for a vacuum tank used in a vacuum unit according to claim 1, characterized in that, The pushing assembly includes a sliding sleeve slidably arranged on the sliding column. Adjusting plates sliding radially along the sliding sleeve are arranged at equal intervals along the circumference of the sliding sleeve. The adjusting plates are hinged to the middle parts of the abutting plates.

6. The laser welding equipment for a vacuum tank used in a vacuum unit according to claim 5, characterized in that, A baffle is slidably arranged left and right on the horizontal section of the adjusting plate. A moving part is slidably arranged left and right on the sliding column. The baffle is slidably connected to the moving part radially along the sliding column.

7. A laser welding device for a vacuum tank used in a vacuum unit according to claim 6, characterized in that, A screw rod is rotatably arranged inside the sliding column. The screw rod is threadedly connected to the sliding sleeve. An abutting ring is rotatably arranged at the left end of the sliding column. A hydraulic cylinder for driving the moving part to slide left and right is fixedly installed on the support.

8. A laser welding device for a vacuum tank used in a vacuum unit according to claim 6, characterized in that, A plurality of spring telescopic rods are hinged to the moving part at equal intervals along its circumference. The spring telescopic rods are hinged to the abutting plates.

9. A laser welding device for a vacuum tank of a vacuum unit according to claim 5, characterized in that, A synchronous ring is rotatably arranged on the left side of the sliding sleeve. Connecting plates are hinged to the synchronous ring at equal intervals along its circumference. The connecting plates are hinged to the corresponding adjusting plates. The adjusting plates are fixedly connected to the sliding sleeve through locking screws.

10. A laser welding device for a vacuum tank used in a vacuum unit according to claim 1, characterized in that, The left side of the abutting plate has an arc-shaped structure that gradually bends away from the axis of the sliding column from right to left. A blocking block is slidably arranged radially along the sliding column in the middle of the abutting plate. A spiral spring is arranged between the blocking block and the abutting plate.

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